Viewing archive of Friday, 26 September 2014
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2014 Sep 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 269 Issued at 2200Z on 26 Sep 2014IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C8 event observed at
26/0544Z from Region 2175 (N16W25). There are currently 8 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(27 Sep, 28 Sep, 29 Sep).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
494 km/s at 26/1404Z. Total IMF reached 7 nT at 26/0724Z. The maximum
southward component of Bz reached -6 nT at 26/1246Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 1093 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (27 Sep, 28 Sep) and
quiet to unsettled levels on day three (29 Sep). Protons have a slight
chance of crossing threshold on days one, two, and three (27 Sep, 28
Sep, 29 Sep).
III. Event Probabilities 27 Sep to 29 Sep
| Class M | 65% | 65% | 65% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Sep 170 Predicted 27 Sep-29 Sep 170/170/175 90 Day Mean 26 Sep 134
V. Geomagnetic A Indices
Observed Afr/Ap 25 Sep 013/012 Estimated Afr/Ap 26 Sep 011/013 Predicted Afr/Ap 27 Sep-29 Sep 011/015-011/015-011/012
VI. Geomagnetic Activity Probabilities 27 Sep to 29 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 50% | 50% | 50% |
All times in UTC
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